android的actionBar的下拉列表

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package com.actionbardemo1;import android.app.ActionBar;import android.app.ActionBar.OnNavigationListener;import android.app.Activity;import android.app.FragmentManager;import android.app.FragmentTransaction;import android.content.Intent;import android.os.Bundle;import android.view.ActionProvider;import android.view.ContextMenu;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ContextMenu.ContextMenuInfo;import android.widget.ArrayAdapter;import android.widget.ShareActionProvider;import android.widget.Toast;public class MainActivity extends Activity {private String[] as;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ActionBar actionBar = getActionBar();actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);as = new String[]{"小明","小刚","小强"};ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_dropdown_item,as);actionBar.setListNavigationCallbacks(adapter, new OnNavigationListener() {@Overridepublic boolean onNavigationItemSelected(int itemPosition, long itemId) {// TODO Auto-generated method stubif(itemPosition==1){Toast.makeText(MainActivity.this, "111", Toast.LENGTH_SHORT).show();// TODO Auto-generated method stubMyListFragment fragment = new MyListFragment();FragmentManager fManager = getFragmentManager();FragmentTransaction fragmentTransaction = fManager.beginTransaction();fragmentTransaction.replace(R.id.container, fragment, as[itemPosition]);fragmentTransaction.commit();}return false;}});}}
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